The man page for ksh says that ${PPID} should be read-only but
apparently it is not. There is also a line nearby that is more
than 80 characters long but I'm not comfortable enough with KNF
to select the best way to fix that.
Index: main.c
===================================================================
RCS file: /cvs/src/bin/ksh/main.c,v
retrieving revision 1.79
diff -u -p -r1.79 main.c
--- main.c 4 Mar 2016 15:11:06 -0000 1.79
+++ main.c 27 May 2016 02:37:41 -0000
@@ -84,7 +84,7 @@ static const char initsubs[] = "${PS2=>
static const char *initcoms [] = {
"typeset", "-r", "KSH_VERSION", NULL,
"typeset", "-x", "SHELL", "PATH", "HOME", NULL,
- "typeset", "-i", "PPID", NULL,
+ "typeset", "-ir", "PPID", NULL,
"typeset", "-i", "OPTIND=1", NULL,
"eval", "typeset -i RANDOM MAILCHECK=\"${MAILCHECK-600}\"
SECONDS=\"${SECONDS-0}\" TMOUT=\"${TMOUT-0}\"", NULL,
"alias",
